US3557784A

Movatterモバイル変換

Info

Publication number: US3557784A
Application number: US786610A
Authority: US
Inventors: Walter A Shields
Original assignee: Individual
Current assignee: Individual
Priority date: 1968-12-24
Filing date: 1968-12-24
Publication date: 1971-01-26
Anticipated expiration: 1988-01-26

Abstract

A syringe comprising a barrel carrying a cartridge containing a liquid medicament and closed at one end by a penetrable closure and the opposite end provided with a plunger slidable in the cartridge. A piercing member is slidable mounted on the barrel to pierce the penetrable closure and permit the discharge of the liquid medicament upon pushing the plunger into the cartridge. The plunger of the cartridge is pushed into the cartridge by spring actuated mechanism mounted in the barrel contiguous to the cartridge plunger and retained in compressed condition by latch members of resilient material and actuated into and out of engagement with the spring actuated mechanism by a pair of manipulating members slidable over the latch members and removable from the latch members and the barrel for the removal of the spring actuated mechanism and the replacement of a spent cartridge.

Description

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[56] References Cited UNITED STATES PATENTS 2,650,591 9/1953 Love 2,667,874 2/1954 Dickinson,

PATENTED JAN 2 6 I97! SHEET [1F 4 ATTORNEY SYRINGE The spring actuated mechanism comprises a piston, a plunger and a spring between the piston and the plunger with the piston contiguous to the cartridge plunger and the spring actuated plunger having an end portion extended from the end of the barrel opposite the end provided with the piercing member and said extended end of the spring actuated plunger provided with a manipulating knob arranged to be engaged by the latch members to maintain the spring in compressed condition. The resiliency of the latch members moves said latch members into and out of engagement with the piston and the manipulating knob of the spring actuated plunger under the control of the sliding movements of the annular members.

In the drawings:

FIG. 1 is a perspective view of the syringe completely assembled and ready for use;

FIG. 2 is a perspective view of a cartridge in condition to be placed in the barrel;

FIG. 3 is a top plan view of the syringe;

FIG. 4 is a sectional view showing the positions of the spring actuated plunger and piston after a cartridge has been positioned in the barrel with the latch members retaining the piston contiguous to the cartridge plunger;

FIG. 5 is a sectional view taken on the line 5-5 of FIG. 3 looking in the direction of the arrows and showing the penetrable closure of the cartridge being pierced by the penetrating member and the spring of the spring actuated mechanism in fully compressed condition;

FIG. 6 is a sectional view showing the spring actuated piston in released condition with the cartridge plunger abutting the penetrable closure of the cartridge indicating that said cartridge is fully spent;

FIG. 7 is a cross-sectional view taken on the line 7-7 of FIG. 5 looking in the direction of the arrows to show latch members retaining the spring actuated piston .in spring compressing position;

FIG. 8 is a cross-sectional view taken on' the line 8-8 of FIG. 5 looking in the direction of the arrows to show the latch members retaining the spring actuated plunger in spring compressing position;

FIG. 9 is an exploded perspective view of the parts of the syringe in their order of assembly; and

FIG. 10 is an exploded perspective view of the cartridge.

The syringe comprises abarrel 11 having a fullyopen end 12 and a center opening 13 at the opposite end. Intermediate the ends of the barrel, there is provided diametrically opposedopenings 14 for a purpose to be hereinafter described.

Acartridge 15 having a penetrable closure in the discharge end comprising abody 16 havingfriction grooves 17 and atapering flow passage 18 closed by a thinpenetrable wall 19 at the extremity of aprotuberance 20 adapted to project through thebarrel opening 13, as shown in FIGS. 4, 5 and 6. The opposite end of thecartridge 15 is closed by aplunger 21 havingfriction grooves 22. Either-the closure 16-20 or the

plunger

21, 22 is first inserted in the cartridge and then the cartridge is filled with aliquid medicament 23 and then the cartridge is fully sealed by either the closure 16-20 or the

plunger

21, 22.

The fully filledcartridge 15 is inserted into thebarrel 11 through theopen end 12 and positioned in said barrel with theprotuberance 20 projecting from theopening 13 of the barrel.

Apiston 24 of a spring actuated mechanism is inserted in thebarrel 11 against theplunger 21 and saidpiston 24 is provided with acenter recess 25 for the reception of an end of aspring 26 having the other end engaged in arecess 27 in one end of aplunger 28 having a manipulatingknob 29 secured to the opposite end of theplunger 28. Theknob 29 is arranged with anannular ridge 30 for a purpose to be hereinafter described. The diameter of the piston isslightly less than the inner diameter of thecartridge 15 so that said piston can slide in said cartridge.

The movement of thepiston 24 and theplunger 28 under the influence of thespring 26 is controlled by latch members comprising a pair oflatches 31 of resilient material pivoted at one end on apin 32 supported byears 33 extended from diametrically opposite portions of thebarrel 11 between theopenings 14 and theopen end 12. The opposite ends of thelatches 31 are provided with lateral end portions orprojections 34 having abeveled edge 35 adapted to project into thebarrel 11 through theopenings 14 to engage abeveled edge 36 on thepiston 24, thebeveled edges 35 being normally positioned out of the bore of the barrel under the influence of the resiliency of the latches, as shown in FIG. 6. A pair oflatches 37 of resilient material are pivoted on thepins 31 between forkedend portions 38 of thelatches 31, as shown in FIGS. 1 and 3, with the free end portions of thelatches 37 arranged with outwardly extending projections orlateral end portions 39 to engage theridge 30 of the manipulatingknob 29. The resilience of thelatches 37 will normally position theprojections 38 into engagement with theridge 30. To facilitate said engagement, the projections are beveled as at 40 to slide over abeveled face 41 of theridge 30.

In assembling the syringe, thecartridge 15 is first inserted into thebarrel 11 with theprotuberance 20 positioned in theopening 13 of the barrel. After thecartridge 15 is inserted into thebarrel 11, thepiston 24, thespring 26 and theplunger 28 are sequentially inserted into the barrel. To permit the insertion of thepiston 24, thespring 26 and theplunger 28 into the barrel 1 1 through theopen end 12, theprojections 34 have to be positioned out of-the bore of thebarrel 11 and theprojections 39 have to be out of the path of movement of theridge 30. This is accomplished by providing two

annular members

42 and 43 arranged with manipulating

annular flanges

44 and 45, respectively, and slidingly engaged on the

latches

31 and 37, respectively. To permit engagement of the

annular members

42 and 43 onto the

latches

31 and 37, respectively, themember 42 is provided with diametrically opposednotches 46 and themember 43 is provided with diametrically opposednotches 47, as shown in FIGS. 1, 7 and 9. The

notches

46 and 47 are of sufficient depth to permit passage of the

projections

34 and 39, respectively, through said notches when the notches are aligned with said projections.

After thepiston 24, thespring 26 and theplunger 28 are assembled in thebarrel 11, theannular member 42 is actuated toward theprojections 34 to position thebeveled edges 35 into engagement with thebeveled edge 36 and retain thepiston 24 in spaced relation to theplunger 21 of thecartridge 15. Theannular member 43 is moved toward thepins 32 to permit theprojections 39 to engage theridge 30 of the manipulatingknob 29 under the influence of the resiliency of thelatches 37, as shown in FIG. 5.

In this position of thepiston 24 and theplunger 28, thespring 26 is compressed and the syringe is in condition to expel theliquid medicament 23 into a patient. Before this is possible, the thinpenetrable wall 19 is punctured by a penetrating member comprising acap member 48 slidably engaged on the end portion of thebarrel 11 arranged with the opening 13 and said cap member is provided withnipples 49 to engage anannular groove 50 in thebarrel 11 and position apiercing spike 51 in spaced relation to the thinpenetrable wall 19, as shown in FIG. 4. Thepiercing spike 51 is carried by abase 52 inserted in thecap member 48. Thecap member 48 is in the position shown in FIG. 4 when the syringe is in condition for storage and shipping. when it is desired to place the syringe in condition for expelling or injecting theliquid medicament 23, thenipples 49 are forcedly disengaged from theannular groove 50 by pushing thecap member 48 onto thebarrel 11 which will force thepiercing spike 51 through the thinpenetrable wall 19.

When it is desired to inject theliquid medicament 23 into a patient, thecap member 48 is removed from its forward position on thebarrel 11, theprotuberance 20 is placed on the patient's skin at the desired point of injection, and theannular member 42 is moved toward theannular member 43 by the person applying the injection engaging the manipulatingknob 29 in the palm of his hand'and the two forward fingers engaging theannular flange 44. Said movement of theannular member 42 will permit thelatches 31 under the influence of their resiliency to move thebeveled edges 35 out of the bore of thebarrel 11 and thespring 26 to forcedly move thepiston 24 against theplunger 21 and expel the liquid medicament into the patient, as shown in H0. 6.

After an injection, theannular member 43 is actuated by engaging theannular flange 45 toward the manipulatingknob 29 to position theprojections 39 out of engagement with theannular ridge 30 which will permit the removal of theplunger 28, thespring 26 and thepiston 24 from the barrel H. The removal of the spring actuated mechanism will permit the removal of the spent or exhausted cartridge from thebarrel 11 and the replacement of a fresh cartridge shown in FIG. 2. The spring actuated mechanism is assembled in thebarrel 11 in the manner hereinbefore described.

lclaim:

l. A syringe comprising a barrel, a cartridge containing a liquid medicament and provided with a penetrable closure in one end projecting from one end of the barrel and a plunger in the other end of the cartridge, spring actuated mechanism removably mounted in the barrel contiguous to the plunger of the cartridge, latch members mountedon an intermediate portion of the barrel and arranged to retain the spring actuated mechanism in the barrel and adapted to be actuated to release the spring actuated mechanism to move'the plunger of the cartridge toward the penetrable closure, and a penetrating member slidably mounted on the end portion of the barrel arranged with the penetrable closure and actuated to pierce said penetrable closure prior to the actuation of the latch members.

2. A syringe as claimed in claim ll, wherein the barrel is provided with an open end to assemble the cartridge andthe spring actuated mechanism in said barrel with the opposite end having a center opening smaller than the inner diameter of the barrel for projecting the penetrable closure of the cartridge.

3. A syringe as claimed in claim 1, wherein the spring actuated mechanism comprises a piston slidable in the barrel, a plunger slidable in the barrel with a portion extended from the barrel, and a spring compressed between the piston and the plunger.

4. A syringe as claimed in claim 3, wherein the latch members comprise two pairs of latches of resilient material supported on the barrel, the first pair oflatches having lateral end portions extended into the barrel to engage and space the piston from the plunger of the cartridge.

5. A syringe as claimed in claim 4, wherein the second pair of latches is provided with lateral portionspositioned beyond the open end of the barrel to engage the extended portion of the plunger of the spring actuated mechanism and retain the plunger in a predetermined position in the barrel.

6. A syringe as claimed inclaim 5, wherein the lateral end portions of the first pair of latches extend toward each other and the lateral end portions of the second pair of latches extend away from each other.

7. A syringe as claimed inclaim 5, wherein the extended portion of the plunger of the spring actuated mechanism is provided with a manipulating knob having an annular ridge to be engaged by the second pair of latches.

8. A syringe as claimed in claim 3, wherein the latch members comprises two pairs of latches of resilient material mounted on a pair of opposed pivots on the barrel, each pivot supporting a latch of each pair, a pair of annular members, each member slidable on a different pair of latches to actuate the free ends of the latches into and out of latching engagement with the piston and the plunger of the spring actuated mechanism.

9. A syringe as claimed in claim 8, wherein each annular member is provided with an annular flange to form a manipulating portion.

10. A syringe as claimed in claim 8, wherein each annular member is arranged with diametrically opposed notches for sliding said annular members on and off the latches.

11. A syringe as claimed in claim 1, wherein the penetrating member comprises a cap member releasably mounted on the barrel and a piercing spike secured in the bottom of the cap member to pierce the penetrable closure of the cartridge upon moving the cap member onto the barrel.

Claims

1. A syringe comprising a barrel, a cartridge containing a liquid medicament and provided with a penetrable closure in one end projecting from one end of the barrel and a plunger in the other end of the cartridge, spring actuated mechanism removably mounted in the barrel contiguous to the plunger of the cartridge, latch members mounted on an intermediate portion of the barrel and arranged to retain the spring actuated mechanism in the barrel and adapted to be actuated to release the spring actuated mechanism to move the plunger of the cartridge toward the penetrable closure, and a penetrating member slidably mounted on the end portion of the barrel arranged with the penetrable closure and actuated to pierce said penetrable closure prior to the actuation of the latch members.

2. A syringe as claimed in claim 1, wherein the barrel is provided with an open end to assemble the cartridge and the spring actuated mechanism in said barrel with the opposite end having a center opening smaller than the inner diameter of the barrel for projecting the penetrable closure of the cartridge.

4. A syringe as claimed in claim 3, wherein the latch members comprise two pairs of latches of resilient material supported on the barrel, the first pair of lAtches having lateral end portions extended into the barrel to engage and space the piston from the plunger of the cartridge.

5. A syringe as claimed in claim 4, wherein the second pair of latches is provided with lateral portions positioned beyond the open end of the barrel to engage the extended portion of the plunger of the spring actuated mechanism and retain the plunger in a predetermined position in the barrel.

6. A syringe as claimed in claim 5, wherein the lateral end portions of the first pair of latches extend toward each other and the lateral end portions of the second pair of latches extend away from each other.

7. A syringe as claimed in claim 5, wherein the extended portion of the plunger of the spring actuated mechanism is provided with a manipulating knob having an annular ridge to be engaged by the second pair of latches.